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Biological denitration method for interflow treatment

A technology of biological denitrification and soil flow, which is applied in the biochemical treatment of various nitrate-containing wastewater and the biological denitrification technology field of soil flow purification, which can solve the problem of uneven mixing of activated sludge and substrate in anoxic pools and small effect of soil flow , affect the reaction rate and other issues, to avoid the decline of carbon source utilization rate, enhance the utilization efficiency, and increase the effect of sludge concentration

Pending Publication Date: 2022-04-01
TONGJI UNIV
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  • Description
  • Claims
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Problems solved by technology

These measures are mainly to control the source of nutrient loss and the runoff process, which can reduce the loss of nitrogen to a certain extent, but the reduction effect on surface runoff is more obvious, and the effect on soil runoff is relatively small
[0005] At the same time, when the anoxic tank with traditional denitrification technology is undergoing biochemical reactions, the surface of the microbial flocs in the tank will adhere to the microbubbles generated by the denitrification reaction, causing the sludge to float up, resulting in uneven mixing of the activated sludge and the substrate in the anoxic tank. , which in turn affects the reaction rate

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  • Biological denitration method for interflow treatment

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Embodiment 1

[0045] A biological denitrification technology for soil flow, comprising the following steps:

[0046] (1) The water quality of sewage in a certain soil is pH: 6.59-7.68, COD mass concentration: 60-70mg / L, TN mass concentration: 30-40mg / L, of which nitrate nitrogen mass concentration: 30-35mg / L, ammonia nitrogen mass concentration Concentration: 3~5mg / L.

[0047] The dredging sand is used as the condensation nucleus of the activated sludge, and the device process is "three-stage (anoxic) biological denitrification + mechanical cyclone separator + sedimentation tank".

[0048] The measured total effective volume of the device is 287m 3 , the effective volume of the primary biological denitrification tank is 46m 3 , sludge load 0.1kgNO 3 - -N / (kg MLSS·d), the effective volume of the secondary biological denitrification tank is 19m 3 , sludge load 0.08kg NO 3 - -N / (kg MLSS·d), the effective volume of the three-stage biological denitrification tank is 14m 3 , sludge load 0...

Embodiment 2

[0055] A biological denitrification technology for soil flow, comprising the following steps:

[0056] (1) The water quality of an industrial sewage is COD mass concentration: 7000~7200mg / L, BOD mass concentration: 4200~4900mg / L, nitrate nitrogen mass concentration: 3400~3600mg / L. The dredging and filling sand is used as the sedimentation-promoting condensation nucleus of the activated sludge, and the device process is "five-stage (anoxic) biological denitrification + mechanical cyclone separation + sedimentation".

[0057] The measured total effective volume of the device is 1100m 3 , of which the effective volume of the primary biological denitrification reaction zone is 620m 3 , sludge load 0.20kg NO 3 - -N / (kg MLSS·d); the effective volume of the secondary biological denitrification reaction zone is 245m 3 , the sludge load is 0.15kg NO 3 - -N / (kg MLSS·d); the effective volume of the three-stage biological denitrification reaction zone is 110m 3 , the sludge load is...

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Abstract

The invention provides a biological denitration method for interflow treatment. The biological denitration method comprises the following specific steps: injecting nitrate-containing interflow sewage into a biological denitration tank; meanwhile, domesticated denitrification sludge or municipal sewage plant sludge is added into the biological denitration tank; adding hydraulic filling sand into the biological denitration tank, and uniformly stirring to form heavy sludge of which the surface is attached with a biological membrane; adding a carbon source into the biological denitration tank, and stirring and fully mixing to complete denitrification reaction; the sludge flows into a mechanical cyclone separator for mud core separation, a mixed solution rich in hydraulic filling sand obtained after separation flows back to the biological denitration tank, and sludge obtained after separation flows into a sedimentation tank for mud-water separation to obtain activated sludge. The device can be applied to sewage treatment with relatively high nitrate nitrogen concentration, is suitable for developing small integrated high-load treatment equipment for nitrate nitrogen-containing interflow sewage and industrial wastewater, and has the advantages of high efficiency, no pollution, high applicability and the like.

Description

technical field [0001] The invention relates to the field of water quality biological purification treatment, and relates to a biological denitrification technology for in-flow purification of soil, which can also be used for biochemical treatment of various nitrate-containing waste water. Background technique [0002] In some areas of my country, there are a large number of mud shales weathered from sandstone or shale. Due to the characteristics of easy weathering, poor corrosion resistance, large porosity, and strong infiltration capacity, nitrogen in the soil is lost in the form of nitrate nitrogen. The runoff with the soil is very serious. If the closure is not carried out, it will cause eutrophication of the nearby surface water body and nitrate pollution of the groundwater. [0003] Among them, the nitrogen loss in the purple soil area of ​​the Sichuan Basin is more serious than other types of soil, and the loss concentration of nitrate nitrogen is more than 20.00mg / L,...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F101/16
Inventor 张超杰孙旭
Owner TONGJI UNIV